Hmm reading this thread// unplugged form full charge... listen to xm for like 30 minutes.. 90%.. for 3 hours, refresh was on to receive gmail and no app install, battery went down to 40%.. received gmail but not a whole lot..

Took my phone off the cradle at 6 AM and had very light use. At 12:45 it is already at 20%.
Having Bluetooth on has taken up 28% which is pretty big. (Who wants to turn bluetooth on and off all the time? - lame.) Been on 4G the whole time in LA which has a strong signal.

I thought this was strange. I plugged in my phone, thinking I would give an intial full charge before turning it on. When I did that it started at 40% out of the box. I then realized I forgot to plug in the LTE card. I unplugged it, pulled the battery, put in the card, reinstalled the battery and plugged it back in. I expected it to be at 40%. It was now at 5%. Very strange, I wonder which one was correct out of the box, 5% or 40%? Pretty big difference.

Bluetooth battery usage is unbelievable. I have not had it connected to a bluetooth device at any point in the day. Currently at 24% battery according to the circle battery widget. Very disappointing to see bluetooth kill so much battery without even being used. Screen on time is 1 hr 25 min.

Just got my Bionic yesterday. Ran it through 2 cycles on the stock battery, 1 time heavy use, 2nd time moderate use. Lasted only 5 hours each time. I'm on the 1st cycle of the extended battery with moderate use and i'm at 8.5 hours with 20% left. I'm hoping it improves with time, i'll let you know. It is slightly clunkier with the extended battery but definitely worth the extra life.